[[add information about the way tcl handles floating point numeric values as C type doubles, the range of values supported, etc.]]

double is an [expr] function (or a [proc] in the [mathfunc] namespace)
[http://www.tcl.tk/man/tcl8.5/TclCmd/mathfunc.htm#M14] for converting tcl numeric strings to floating-point and returning the converted value.

See also [Inf].


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